23 research outputs found
Enhanced wave localization in multifractal scattering media
In this paper we study the structural, scattering, and wave localization
properties of multifractal arrays of electric point dipoles generated from
multiplicative random fields with different degrees of multiscale correlations.
Specifically, using the rigorous Green's matrix method, we investigate the
scattering resonances and wave localization behavior of systems with
dipoles and demonstrate an enhanced localization behavior in highly
inhomogeneous multifractal structures compared to homogeneous fractals, or
monofractals. We show distinctive spectral properties, such as the absence of
level repulsion in the strong multiple scattering regime and power-law
statistics of level spacings, which indicate a clear localization transition
enhanced in non-homogeneous multifractals. Our findings unveil the importance
of multifractal structural correlations in the multiple scattering regime of
electric dipole arrays and provide an efficient model for the design of
multiscale nanophotonic systems with enhanced light-matter coupling and
localization phenomena beyond what is possible with traditional fractal
systems
Multichannel remote polarization control enabled by nanostructured Liquid Crystalline Networks
In this article we demonstrate that a grating fabricated through nanoscale
volumetric crosslinking of a liquid crystalline polymer enables remote
polarization control over the diffracted channels. This functionality is a
consequence of the responsivity of liquid crystal networks upon light stimuli.
Tuning the photonic response of the device is obtained thanks to both a
refractive index and a shape change of the grating elements induced by a
molecular rearrangement under irradiation. In particular, the material
anisotropy allows for nontrivial polarization state management over multiple
beams. Absence of any liquid component and a time response down to 0.2
milliseconds make our device appealing in the fields of polarimetry and optical
communications.Comment: 16 pages,8 figures, featured article in AL